Make version bump manual-only and remove Slack notification

We now apply semantic version tags deliberately (see v1.7.19–v1.9.2), so the
daily auto-bump is no longer wanted.

- Drop the `schedule:` cron (and the now-unneeded DST guard) — the workflow
  runs only on `workflow_dispatch`, with patch/minor/major options.
- Remove the Slack notification entirely: the "Update changelog canvas" and
  "Post to Slack" steps (and the PR/bullet collection that fed them) are gone,
  along with their SLACK_* secret usage.
- Keep the core behavior: compute the next version from the latest tag + chosen
  bump and push an annotated tag.

Renames the workflow "Daily Version Bump" -> "Version Bump".

.github/workflows/deploy-notify.yml

@@ -1,10 +1,8 @@
-name: Daily Version Bump
+name: Version Bump
 
+# Manual only. Semantic version tags are applied deliberately (patch/minor/major);
+# there is no daily auto-bump and no Slack notification.
 on:
-  schedule:
-    # 6pm ET (EDT = 22:00 UTC, EST = 23:00 UTC)
-    - cron: "0 22 * * *"
-    - cron: "0 23 * * *"
   workflow_dispatch:
     inputs:
       bump:
@@ -13,165 +11,35 @@ on:
         options:
           - patch
           - minor
+          - major
         default: patch
 
 permissions:
   contents: write
-  pull-requests: read
 
 jobs:
-  notify:
+  tag:
     runs-on: ubuntu-latest
-    env:
-      GH_TOKEN: ${{ github.token }}
     steps:
       - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           fetch-tags: true
 
-      - name: DST guard
-        id: dst
-        run: |
-          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
-            echo "Manual trigger — skipping DST guard"
-            echo "skip=false" >> "$GITHUB_OUTPUT"
-            exit 0
-          fi
-          HOUR=$(TZ=America/New_York date +%H)
-          if [ "$HOUR" != "18" ]; then
-            echo "ET hour is $HOUR, not 18 — wrong DST rule fired"
-            echo "skip=true" >> "$GITHUB_OUTPUT"
-          else
-            echo "skip=false" >> "$GITHUB_OUTPUT"
-          fi
-
-      - name: Collect merged PRs since last version
-        if: steps.dst.outputs.skip != 'true'
-        id: changes
+      - name: Compute and push next version tag
         run: |
           LAST_TAG=$(git tag -l 'v*' --sort=-v:refname | head -1)
-
-          if [ -z "$LAST_TAG" ]; then
-            echo "No previous version tag"
-            echo "has_changes=false" >> "$GITHUB_OUTPUT"
-            exit 0
-          fi
-
-          LAST_TAG_DATE=$(TZ=UTC git log -1 --date=format-local:'%Y-%m-%dT%H:%M:%SZ' --format='%ad' "$LAST_TAG")
-          PRS=$(gh pr list --state merged --json number,title,mergedAt \
-            --jq "sort_by(.number) | .[] | select(.mergedAt > \"$LAST_TAG_DATE\")")
-
-          if [ -z "$PRS" ]; then
-            echo "No PRs merged since $LAST_TAG"
-            echo "has_changes=false" >> "$GITHUB_OUTPUT"
-            exit 0
-          fi
-
-          echo "has_changes=true" >> "$GITHUB_OUTPUT"
-
-          # Semver bump (default: patch)
-          BUMP="${{ github.event.inputs.bump || 'patch' }}"
+          LAST_TAG="${LAST_TAG:-v0.0.0}"
           MAJOR=$(echo "$LAST_TAG" | sed 's/^v//' | cut -d. -f1)
           MINOR=$(echo "$LAST_TAG" | sed 's/^v//' | cut -d. -f2)
           PATCH=$(echo "$LAST_TAG" | sed 's/^v//' | cut -d. -f3)
-          if [ "$BUMP" = "minor" ]; then
-            VERSION="v${MAJOR}.$((MINOR + 1)).0"
-          else
-            VERSION="v${MAJOR}.${MINOR}.$((PATCH + 1))"
-          fi
-          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
 
-          # Build bullet lists from PR titles
-          TITLES=$(gh pr list --state merged --json number,title,mergedAt \
-            --jq "sort_by(.number) | .[] | select(.mergedAt > \"$LAST_TAG_DATE\") | .title")
+          case "${{ inputs.bump }}" in
+            major) VERSION="v$((MAJOR + 1)).0.0" ;;
+            minor) VERSION="v${MAJOR}.$((MINOR + 1)).0" ;;
+            *)     VERSION="v${MAJOR}.${MINOR}.$((PATCH + 1))" ;;
+          esac
 
-          {
-            echo "slack_bullets<<ENDSLACK"
-            echo "$TITLES" | sed 's/ *(#[0-9]*)//g; s/^/• /'
-            echo "ENDSLACK"
-          } >> "$GITHUB_OUTPUT"
-
-          {
-            echo "canvas_bullets<<ENDCANVAS"
-            gh pr list --state merged --json number,title,mergedAt \
-              --jq "sort_by(.number) | .[] | select(.mergedAt > \"$LAST_TAG_DATE\") | \"* \(.title) (PR #\(.number))\"" \
-              | sed 's/ *(\(#[0-9]*\))\( (PR\)/ \2/; s/) (PR / (PR /'
-            echo "ENDCANVAS"
-          } >> "$GITHUB_OUTPUT"
-
-      - name: Create version tag
-        if: steps.changes.outputs.has_changes == 'true'
-        run: |
-          git tag ${{ steps.changes.outputs.version }}
-          git push origin ${{ steps.changes.outputs.version }}
-
-      - name: Update changelog canvas
-        if: steps.changes.outputs.has_changes == 'true'
-        env:
-          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
-          CANVAS_ID: ${{ secrets.SLACK_CANVAS_ID }}
-          SECTION_ID: ${{ secrets.SLACK_CANVAS_INTRO_SECTION }}
-          VERSION: ${{ steps.changes.outputs.version }}
-          CANVAS_BULLETS: ${{ steps.changes.outputs.canvas_bullets }}
-        run: |
-          TODAY=$(TZ=America/New_York date +%Y-%m-%d)
-          read -r -d '' MARKDOWN <<ENDMD || true
-          ---
-
-          ## ${VERSION} — ${TODAY}
-
-          ${CANVAS_BULLETS}
-          ENDMD
-          MARKDOWN=$(echo "$MARKDOWN" | sed 's/^          //')
-
-          RESPONSE=$(curl -s -X POST https://slack.com/api/canvases.edit \
-            -H "Authorization: Bearer $SLACK_BOT_TOKEN" \
-            -H "Content-Type: application/json" \
-            -d "$(jq -n \
-              --arg canvas_id "$CANVAS_ID" \
-              --arg section_id "$SECTION_ID" \
-              --arg markdown "$MARKDOWN" \
-              '{
-                canvas_id: $canvas_id,
-                changes: [{
-                  operation: "insert_after",
-                  section_id: $section_id,
-                  document_content: {
-                    type: "markdown",
-                    markdown: $markdown
-                  }
-                }]
-              }')")
-
-          echo "$RESPONSE" | jq .
-          if [ "$(echo "$RESPONSE" | jq -r .ok)" != "true" ]; then
-            echo "::warning::Canvas update failed: $(echo "$RESPONSE" | jq -r .error)"
-          fi
-
-      - name: Post to Slack
-        # Temporarily disabled — Dependabot noise, see #55
-        if: false && steps.changes.outputs.has_changes == 'true'
-        env:
-          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
-          SLACK_CHANNEL_ID: ${{ secrets.SLACK_CHANNEL_ID }}
-          CANVAS_ID: ${{ secrets.SLACK_CANVAS_ID }}
-          VERSION: ${{ steps.changes.outputs.version }}
-          SLACK_BULLETS: ${{ steps.changes.outputs.slack_bullets }}
-        run: |
-          CANVAS_URL="https://app.slack.com/docs/${CANVAS_ID}"
-          read -r -d '' TEXT <<ENDTXT || true
-          *After-Hours Scheduler has been updated to ${VERSION}*
-
-          Here's a brief summary of what changed:
-          ${SLACK_BULLETS}
-
-          <${CANVAS_URL}|Click here to read the full changelog>
-          ENDTXT
-          TEXT=$(echo "$TEXT" | sed 's/^          //')
-
-          curl -s -X POST https://slack.com/api/chat.postMessage \
-            -H "Authorization: Bearer $SLACK_BOT_TOKEN" \
-            -H "Content-Type: application/json" \
-            -d "$(jq -n --arg channel "$SLACK_CHANNEL_ID" --arg text "$TEXT" \
-              '{channel: $channel, text: $text}')"
+          echo "Bumping $LAST_TAG -> $VERSION"
+          git tag -a "$VERSION" -m "$VERSION"
+          git push origin "$VERSION"